comparison mercurial/revlogutils/nodemap.py @ 48693:de3ac3d2c60b

stream-clone: allow to change persistent-nodemap format during stream clone

Persistent nodemap affect the store format. However it is fairly isolated and
fast to generate locally. So not making it a fixed part of the stream clone is
useful.

This allow clients without persistent-nodemap support (default for client
without Rust enabled, or simply older client). So it make it possible to enable
persistent nodemap on client, where it can provide a massive boost. without too
much consequence.

To do so, we stop using it in the advertisement requirements for streaming and
let the client add/remove the necessary file depending of its configuration.

We still send the files as it seems like a small save to not regenerate them.
In addition, the way we match them will overlap with the changelog-v2/revlog-v2
so we can't simply skip the associated patterns.

Differential Revision: https://phab.mercurial-scm.org/D12096

48692:4933086bebf5

from ..node import hex

from .. import (
    error,
    util,
)
from . import docket as docket_mod

    """hook point for test

    This let tests to have things happens between the docket reading and the
    data reading"""
    pass


def persisted_data(revlog):
    """read the nodemap for a revlog from disk"""
    if revlog._nodemap_file is None:

48693:de3ac3d2c60b

from ..node import hex

from .. import (
    error,
    requirements,
    util,
)
from . import docket as docket_mod

    """hook point for test

    This let tests to have things happens between the docket reading and the
    data reading"""
    pass


def post_stream_cleanup(repo):
    """The stream clone might needs to remove some file if persisten nodemap
    was dropped while stream cloning
    """
    if requirements.REVLOGV1_REQUIREMENT not in repo.requirements:
        return
    if requirements.NODEMAP_REQUIREMENT in repo.requirements:
        return
    unfi = repo.unfiltered()
    delete_nodemap(None, unfi, unfi.changelog)
    delete_nodemap(None, repo, unfi.manifestlog._rootstore._revlog)


def persisted_data(revlog):
    """read the nodemap for a revlog from disk"""
    if revlog._nodemap_file is None: